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WO2007013850A2 - Programmation pour le positionnement de la difference de temps d'arrivee de liaison montante et de liaison descendante - Google Patents

Programmation pour le positionnement de la difference de temps d'arrivee de liaison montante et de liaison descendante Download PDF

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Publication number
WO2007013850A2
WO2007013850A2 PCT/SE2006/050213 SE2006050213W WO2007013850A2 WO 2007013850 A2 WO2007013850 A2 WO 2007013850A2 SE 2006050213 W SE2006050213 W SE 2006050213W WO 2007013850 A2 WO2007013850 A2 WO 2007013850A2
Authority
WO
WIPO (PCT)
Prior art keywords
scheduling
positioning
information
radio base
base stations
Prior art date
Application number
PCT/SE2006/050213
Other languages
English (en)
Other versions
WO2007013850A3 (fr
Inventor
Torbjörn WIGREN
Jonas Karlsson
Bo Göransson
Stefan Parkvall
Ari Kangas
Dirk Gerstenberger
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to CN2006800269384A priority Critical patent/CN101228807B/zh
Priority to EP06748052.5A priority patent/EP1908317B1/fr
Priority to US11/996,648 priority patent/US20090323596A1/en
Priority to JP2008523841A priority patent/JP2009503992A/ja
Publication of WO2007013850A2 publication Critical patent/WO2007013850A2/fr
Publication of WO2007013850A3 publication Critical patent/WO2007013850A3/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0226—Transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources

Definitions

  • the present invention relates to methods and arrangements in telecommunication systems for scheduling on the uplink and downlink in conjunction with positioning tasks for user equipments in said system.
  • Cellular telecommunication systems can be equipped to perform a number of different positioning methods to enable location services to the cellular subscribers.
  • Cell-ID positioning determines the cell to which the user equipment (UE) is connected. The position of the user is hence determined with cell granularity. Typically the radio network controller (RNC) of the radio network (RAN) determines a 3-15 corner polygon that determines the geographical extension of the cell. The corners of this polygon are given as latitude, longitude pairs in the WGS84 geographical reference system.
  • the cell-ID method is the backbone of all cellular positioning system since it is always available when the UE can be connected to the system.
  • Ecell-ID positioning augments the Cell-ID positioning with auxiliary information that narrows down the area that is determined by the cell polygon.
  • WCDMA wideband code division multiple access
  • the most useful method in the wideband code division multiple access (WCDMA) system is the round trip time (RTT) measurement. This measurement determines the travel time, back and forth, from the radio base station (RBS) to the UE and back. Using the speed of light, the distance from the known position of the RBS to the UE can be calculated which determines a circular strip around the RBS where the UE is located. The thickness of the strip is determined by the measurement uncertainty.
  • the Ecell-ID method is obtained by noticing that the UE is located both in the cell and in the circular strip - hence the UE is located in the intersection of these two geographical regions .
  • A-GPS positioning is an enhancement of the US military global positioning system (GPS) .
  • GPS reference receivers attached to, e.g., a cellular communication system collect assistance data that, when transmitted to GPS receivers in terminals connected to the cellular communication system, enhances the performance of the GPS terminal receivers.
  • A-GPS accuracy can become as good as 10 meters also without differential operation. The accuracy becomes worse in dense urban areas and indoors, where the sensitivity is often not high enough for detection of the very weak signals from the GPS satellites.
  • Advantages of A-GPS include a high accuracy. The method easily meets the North American emergency positioning E-911 requirements of 50 meters for 67% of all positionings and 150 meters for 95% of all positionings.
  • a drawback is the limited indoor coverage, which is a result of the low ranging signal strengths that are obtained at ground level.
  • Downlink time difference of arrival with idle periods in the downlink refers to a positioning method that is similar to A-GPS m that it relies on time difference of arrival measurements.
  • the OTDOA IPDL method uses UE measurements of Pilot radio (CPICH in WCDMA) signals transmitted from several RBSs. The measurement results are signalled to the RNC, where a hyperbolic t ⁇ lateration method is used for calculation of the position of the UE.
  • CPICH in WCDMA Pilot radio
  • Uplink time difference of arrival is a positioning method that is currently under standardization within the
  • 3GPP organization It is similar to A-GPS in that it relies on time difference of arrival measurements. However, the
  • UTDOA method uses RBS (or separate location measurement unit
  • LMU Location Measurement
  • the transmitted signal is detected in a number of RBSs or LMUs, after which the measured results are signalled to a positioning node where the position of the UE is determined by a trilateration method.
  • a reference signal In order to be able to detect the time of arrival from measurements of opportunity from the UE, a reference signal first needs to be created in a master-LMU or master RBS. This is done by decoding of the signal, followed by reconstruction of the chip stream that then forms the reference signal.
  • An advantage of UTDOA positioning is that it provides a better indoor coverage than does A-GPS. Outdoor accuracy is normally inferior to A-GPS though.
  • At least 6-8 RBSs need to be detected in the UE in case OTDOA-IPDL positioning is used.
  • OTDOA-IPDL positioning For UTDOA positioning at least 6-8 RBSs need to detect the UE transmissions in order to obtain useful position estimates in practical environments.
  • OFDM orthogonal frequency division multiple
  • one main alternative is localized FDMA, where the scheduler assigns to a UE a specific bandwidth to be used for a specific period in time. This time duration is typically rather short, in the (sub-) millisecond range, after which other terminals are commanded to transmit.
  • the frequency band assigned to a terminal can be contiguous or non-contiguous in frequency. It should be noted that the disclosed techniques of the present invention disclosure may also be partly applicable to other access schemes than those discussed here.
  • the multiple access scheme for an uplink is a combination of
  • Frequency-division and time division multiple access where each user is allocated one set of resources in the frequency domain (with adjustable bandwidth) for a given and variable period of time (time slots with variable length) , and
  • HSDPA high speed downlink packet access
  • EUL enhanced uplink
  • the main idea in HSDPA is fast scheduling of transmissions between the RBS and the UEs so that the communication with a specific UE occurs at instances in time where the radio conditions are favourable (e.g. avoiding fading dips).
  • the enhanced uplink concept rather schedules excess capacity of the uplink so that enhanced uplink traffic is allocated to periods of time when the total load of the uplink is sufficiently low.
  • A-GPS positioning is a high precision technology, however, with only limited indoor positioning availability as a major drawback while OTDPA-IPDL and UTDOA positioning have the technical potential to provide better indoor coverage than A-GPS and to deliver good precision whereby, however, the presently available detection sensitivities are not sufficient to provide a good enough accuracy.
  • a problem is then that orthogonality is not perfect; rather orthogonality is limited by the cross correlation properties of the scrambling codes.
  • This object is achieved by a scheduling manager 111,211 and a method in said manager for co-ordinating the scheduling and measurement timing of first and second positioning schedulers 122,222 that, respectively, allocate uplink and downlink radio resources.
  • Said first and second positioning schedulers 122,222 which are integrated with existing schedulers 123,223 for accounting, e.g., load and available hardware resources, aim at securing a sufficiently perfect orthogonality in order to relax the interference conditions that normally limit the positioning detection performance by allocating uplink radio resources and downlink radio resources, respectively, on the air interface in order to secure a successful positioning ( time-of-arrival) measurement for a user equipment 13,23 that is to be positioned.
  • the user equipment 13,23 need not be located in a cell served by the radio base station unit 12,22 in question.
  • the scheduling manager 111,211 typically resides in a centralised network node 11,21, e.g. the RJN[C of a WCDMA system, whereas the positioning schedulers 122,222 can reside, e.g., in the radio base stations 12,22 of the radio access network. However, it is possible to locate the scheduling manager and positioning schedulers in whatever network unit that is responsible for scheduling tasks and the handling of positioning information.
  • the scheduling manager 111,211 is either a part of the unit
  • the scheduling manager 111,211 is responsible for at least the following functionality :
  • Receiving commands for terrestrial positioning measurements of a user equipment preferably together with information that support the scheduling of such measurements, e.g. the cell ID of the cell where the user equipment is connected and a list of "close enough" radio base stations where radio resources for positioning measurements are to be scheduled.
  • the information may include presently available radio resources, for instance free frequency bands, time slots in the uplink, free orthogonal tones in the downlink.
  • Figure 1 illustrates a block diagram of an uplink positioning scheduler.
  • Figure 2 illustrates a block diagram of a downlink positioning scheduler.
  • Figure 3 illustrates detailed block diagrams of a radio network controller and a radio base station in which the present invention can be integrated.
  • the present invention assumes introduction of orthogonality between terminals as far as terrestrial (OTDOA-IPDL and/or UTDOA) positioning measurements are concerned which, however, implies the problem that orthogonality is not perfect but rather limited by the cross correlation properties of the scrambling codes.
  • OTDOA-IPDL and/or UTDOA ultrasonic positioning measurements
  • the downlink cross correlation suppression is worse than 10* log10(38400) - 45dB since the code length is 38400 chips.
  • the cross correlation suppression may be only 35 dB . This follows since in GPS the cross correlation performance is optimized by the use of Gold-codes.
  • the performance is anyway about 7 dB below the theoretical limit, so a loss of 10 dB seems to be a realistic assumption for the scrambling codes used in current 3G WCDMA-systerns .
  • close to an additional 20 dB of processing gain may be needed in order to get a sufficient performance when applying terrestrial positioning methods in this case.
  • the code length is longer and a higher processing gain is possible by integrating over a sufficiently long time period.
  • (coherent) accumulation of energy over a long period of time may be cumbersome as the propagation conditions and/or UE position may change during this period.
  • figure 1 depicting the uplink method
  • figure 2 depicts the downlink method.
  • Both figures depict typical WCDMA RAN configurations; the present invention, however, is not limited to such configurations but may be implemented in many other ways .
  • the information signalled to the radio base stations in a downlink positioning application is different for different transmitting radio base stations.
  • orthogonality can be maintained in the receiving UE that performs the time of arrival positioning measurements.
  • scheduling for orthogonality needs to account for different sets of transmitting radio base stations, a fact that may couple the scheduling task over the entire RAN.
  • the task is to ensure that the transmissions from different user equipments that may interfere are scheduled so as to maintain orthogonality. This requires scheduling of allowed frequency bands and time slots for positioning transmissions over "close enough" simultaneous terrestrial positionings over the RAN .
  • the Radio Network Controller 11 receives a LOCATION REPORTING CONTROL message 116.
  • the unit 112 responsible for user equipment (UE) positioning determines that an uplink terrestrial positioning method is to be used.
  • the UE positioning may determine, e.g., the geographical Cell-ID position of the user equipment 13 or even compute a list of radio base stations 12,121 that are within range from the user equipment 13 to be positioned.
  • the unit 112 responsible for UE positioning function forwards this information to the Positioning Scheduler Manager 111 in form of a command to schedule positioning measurements.
  • the Positioning Scheduler Manager 111 may be a part of the unit 112 responsible for UE Positioning.
  • the forwarded information includes preferably the interval in time during which the positioning measurements shall be completed.
  • the Positioning Scheduler Manager 111 may first need to retrieve information from all the radio base stations 12,121 that are involved in the new positioning. This information is signalled across the Iub- , or possibly the Iur- , interface.
  • the signalled information 114 includes at least information on time slots, frequency bands, and priorities for resources that are already allocated to other user equipments that perform positioning transmissions.
  • the Positioning Scheduler Manager 111 determines the allowed time slot(s), the allowed frequency band(s), and bandwidth that the positioning scheduler(s) 122 for each involved radio base station 12 may use for final scheduling of radio resources for positioning measurements. Optionally, a priority value may also be assigned. This information is then sent over Iub to each (tentatively) involved radio base station 12 as part of a scheduling command 113.
  • the Positioning Scheduler 122 of a radio base station 12 (which is a part of an overall Scheduler 123 of the radio base station) that receives such information enters it into the Scheduler 123 of the radio base station 12, where the demand for resources is balanced against other traffic and available hardware resources.
  • a grant i.e. a scheduling command 124
  • This command may be issued directly over the Uu-interface or over RRC from the radio network controller 11. This latter alternative would also require backward signalling to the radio network controller over Iub.
  • the radio base stations 12 receive the radio signal from the user equipment 13 that is intended for the time-of-arrival measurement in a unit 126 of the radio base station 12. The time-of-arrival is then estimated and forwarded over Iub to the unit responsible for UE Positioning 112. Using measurement results from all radio base stations 12,121, the unit 112 responsible for UE Positioning determines the position estimate and reports it back to the core network with a LOCATION REPORT 117 over the Iu-interface .
  • the procedure begins by the reception of a LOCATION REPORTING CONTROL message 216 in the radio network controller.
  • the unit 212 responsible for positioning determines that a downlink terrestrial positioning method is to be used.
  • the unit 112 for UE positioning may determine, e.g., the geographical Cell-ID position of the user equipment 23 or even compute a list of radio base stations 22,221 that are within range from the user equipment 23 that is to be positioned.
  • the unit 112 responsible for UE positioning forwards the information to the Positioning Scheduler Manager 211 in form of a command to schedule positioning measurements.
  • the Positioning Scheduler Manager 211 may be a part of the UE Positioning function 211.
  • the forwarded information includes preferably the interval in time during which the positioning measurements must be completed.
  • the Positioning Scheduler Manager 211 may first need to retrieve information from all the radio base stations 22,221 that are involved in the new positioning. This information is signalled across the Iub- , or possibly the Iur- , interface. The signalled information
  • the Positioning Scheduler 214 includes at least the tones and priorities for resources that are already allocated to other user equipments that perform positioning measurements.
  • Manager 211 determines the allowed time slot(s) and the allowed tone(s) that the positioning scheduler (s) 222 of each involved radio base station 22 may use for final scheduling of radio resources for positioning measurements. Optionally, a priority may also be assigned. This information is then sent over the Iub-interface to each
  • the Positioning Scheduler 222 of a radio base station (which is a part of an overall Scheduler 223 of the radio base station) that receives such information enters it into the Scheduler 223 of the radio base station 22, where the demand for resources is balanced against other traffic and available hardware resources.
  • the radio base station 22 will initiate transmissions accordingly.
  • the user equipment 23 has been informed to initiate positioning measurements at the correct tone(s) .
  • This command may either be signalled directly over the Uu-interface or over RRC. This latter alternative would also require backward signalling to the radio network controller 21 over the Iub- interface.
  • the user equipment receives the radio signal from each radio base station 22 that is intended for the time of arrival measurement. The time of arrival is then estimated and reported over RRC to the unit 212 responsible for UE Positioning.
  • the unit 212 responsible for UE Positioning determines the position estimate and reports it i ⁇
  • the radio access network is synchronized.
  • the invention is however applicable also to unsynchronized RANs provided that the time relation between the RBSs and the UE are determined by other means. Given such relative timing information, the Positioning Scheduler Manager function can still operate as described above. Another alternative would be to introduce guard bands in time and frequency.
  • the uplink and downlink radio access schemes used for the description of the present invention can of course be switched. Similar techniques can be applied also to other access methods. In such cases the signaled information would also be subject to change.
  • the distribution of functionality in the RAN can be different than in the present IE.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention a trait à des procédés et des agencements pour la programmation de positionnement de voies et de trafic en vue de la récupération d'une orthogonalité suffisamment parfaite comprenant la programmation de tâches pour la direction de liaison descendante et de liaison montante. Un gestionnaire de programmation coordonne la programmation et la synchronisation de mesure de premier et deuxième programmateurs de positionnement qui, respectivement, allouent des ressources radio de liaison montante et de liaison descendante.
PCT/SE2006/050213 2005-07-26 2006-06-21 Programmation pour le positionnement de la difference de temps d'arrivee de liaison montante et de liaison descendante WO2007013850A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN2006800269384A CN101228807B (zh) 2005-07-26 2006-06-21 用于调度用户设备的定位信息的方法和装置
EP06748052.5A EP1908317B1 (fr) 2005-07-26 2006-06-21 Programmation pour le positionnement de la difference de temps d'arrivee de liaison montante et de liaison descendante
US11/996,648 US20090323596A1 (en) 2005-07-26 2006-06-21 Scheduling For Uplink And Downlink Time Of Arrival Positioning
JP2008523841A JP2009503992A (ja) 2005-07-26 2006-06-21 アップリンクおよびダウンリンクにおける到着時間ポジショニングのためのスケジューリング方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0501741-3 2005-07-26
SE0501741 2005-07-26

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WO2007013850A2 true WO2007013850A2 (fr) 2007-02-01
WO2007013850A3 WO2007013850A3 (fr) 2007-03-08

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US (1) US20090323596A1 (fr)
EP (1) EP1908317B1 (fr)
JP (1) JP2009503992A (fr)
CN (1) CN101228807B (fr)
WO (1) WO2007013850A2 (fr)

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WO2012115557A1 (fr) * 2011-02-22 2012-08-30 Telefonaktiebolaget L M Ericsson (Publ) Dispositifs et procédés de positionnement dans des systèmes de communication cellulaires
EP2679061A4 (fr) * 2011-02-22 2017-03-29 Telefonaktiebolaget LM Ericsson (publ) Dispositifs et procédés de positionnement dans des systèmes de communication cellulaires
US9451575B2 (en) 2011-02-22 2016-09-20 Telefonaktiebolaget L M. Ericsson Positioning devices and methods in cellular communication systems
US20140334401A1 (en) * 2013-05-13 2014-11-13 Qualcomm Incorporated Access point-assisted positioning framework
WO2014186145A1 (fr) * 2013-05-13 2014-11-20 Qualcomm Incorporated Cadre de positionnement assisté par point d'accès
US9971014B2 (en) 2013-05-13 2018-05-15 Qualcomm Incorporated Access point-assisted positioning framework
WO2018057205A1 (fr) * 2016-09-22 2018-03-29 Qualcomm Incorporated Facilitation d'une détermination d'emplacement d'un équipement utilisateur qui est connecté à une radio maîtresse sur la base de mesures de radio esclave
US10149133B2 (en) 2016-09-22 2018-12-04 Qualcomm Incorporated Facilitating a location determination of a user equipment that is connected to a master radio based upon slave radio measurements
WO2022055997A1 (fr) * 2020-09-10 2022-03-17 Qualcomm Incorporated Hiérarchisation de rapports associés au positionnement dans une liaison montante
CN116018777A (zh) * 2020-09-10 2023-04-25 高通股份有限公司 上行链路中的定位相关报告的优先化
US11917441B2 (en) 2020-09-10 2024-02-27 Qualcomm Incorporated Prioritization of positioning-related reports in uplink

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Publication number Publication date
EP1908317A2 (fr) 2008-04-09
CN101228807A (zh) 2008-07-23
EP1908317B1 (fr) 2013-11-13
CN101228807B (zh) 2012-10-10
EP1908317A4 (fr) 2012-07-18
US20090323596A1 (en) 2009-12-31
JP2009503992A (ja) 2009-01-29
WO2007013850A3 (fr) 2007-03-08

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